Plate glass polisher



Nov. 14, 1933. H. J. GALEY 1,934,797

PLATE- GLASS POLISHER Filed May 27, 1930 3 Sheets-Sheet l YINVENTOR Nov. 14, 1933. H. J. GALEY PLATE GLASS POLISHER Filed May 27, 1950 3 Sheets-meet 2 INENTOR Nov. 14, 1933. J GALEY 1,934,797

PLATE GLASS POLISHER Filed May 27, 1930 3 Sheets-Sheet 3 INVENTOR Q Patented 14, 1933 v i ATE OFF CE r 1i I i I V [i LA'rn 'eisAss PYOLIVSHERJY Henry J. Galey, Tarentum, Pa., assignor to'Pittsburgh Plate Glass Company, a. corporation of Pennsylvania; i ff'fiAiipl ea u May 2 21 1930. Serial No. 456,110 i s oleimsfi-(oL s gma The, invention relates toplate glass polishers. to, '7 is the body of the'block of cast iron or In the continuous surfacing operation the glass other suitable material; 8 is the polishing felt plates to be surfaced arecarried upontables behaving its edges turned up along the'edges of the neath a driven surfacing unit. Thepolishing' block, and clamped thereto bymeans of the ring units comprise runner frames in the form of 9; and 10 is a ball at the lower end of the spindle spiders rotated by suitable driving means and 5 fitting a socket in the top of the plate 7 and. carrying the polishing blocks mounted for uniheld by means of the block 11, in turn secured versal movement upon spindles which are freely by the bolts 12. The center of gravity is below movable through the runner arms in a vertical the center of supportof the block on the ball 10,

V 10 direction. The centers of gravity of the polishso that under the action of centrifugal force as 5 ing blocks lie below their centers of universal the arm 4 rotates, the block t'ends to assume the support so that under the action of centrifugal position shown in Fig. 4. To counteract this acforce incidentto'the rotation of the runner frame tion, a magnet 13 is employed, which magnet is at a relatively high rate of speed, the block has secured to the arm 4 by means of the bolts15 15 a tendency to tilt, so that the polishing felt The coils of the magnet aresupplied with curpresses more lightly on the glass over the outer rent bymeans of the leads 14. A pair of colhalf of its area than over its inner half; Under lector rings 15 and 16 are carried on the spider these conditions, .(l) the polishing efliciency of. and contact is made with'suchrings by means the runner is reduced somewhatas compared of the brushesl'? and 18 supplied'from'leadsin 20, with a block which presses evenly on, the sur the'cable 19. The construction may bearranged face of the glass throughout the area of the so that current is supplied continuouslyto the block, and (2) the extreme margins of the sheet coils of the magnet, or this supply of current are not as well polished as the body of the sheet maybe made intermittent so that the magnet is inside such margins. 1 energized only when the polisher block is adja- 25. The present invention is designed to. overcome cent the outer side of'the' glasssheet 2, as it the tendency of the block to tilt under thegaction is this part'of the sheet which is ordinarily under- I of centrifugal force, so that the block :exerts a polished. The magnet tends to move the inner uniform pressure on the glassthroughout its edge of the plate 7 upward and. this forces the area. Certain embodiments of the invention are opposite edge downward, thus counter-balancing 30 illustrated in theaccompanying drawings wherethe tendency of the block to tilt, as indicatedin 5 a I I Fig. 4. The magnetic force may be so adjusted Figure 1 is a vertical section through a polishthat it is just sufficient to counterbalance the ing machine embodying the invention. Fig. 2 is tendency of the block'to tilt; or it may be somean enlarged section through one of the 'polish-' What greater so that the block bears down harder 35; ing blocks andcooperati'ng parts. Fig 3 is a against the glass at its outer edge than at its 99, section on the line III-III of Fig. 2. Fig. 4 is a inner-edge, thus giving the additional polishing partial section and partial side elevationillustrateffect. a ing the tendency of theblock to tilt under the Fig- 5 illustrates a modification in which the action of centrifugal force. Fig. 5 is a vertical magnet 6 is ated 011 e g ard member 1'7 v 40 section through a'modification. And Figs. 6 and along the-line of movement of the table. In this 7 illustrate a modified construction in which case the plate 1'7 of the block is provided with weights are employed to secure'the counterbalan'Outward y pr j ne e 18 which passes ancing effect upon the polishing blocks. over the poles of the magnet. This accomplishes j Referring to Figs. .1 and 4, 1 is atable carrysubstantially the same result as that secured in 45. ing a glass sheet 2 and, movable on the tracks'3 the other c t ucti as t e magnet pulls e beneath the polishing runner having the-arms 4; outer side of the plate 17 down, thus increasing 5 is thespindle of the polishing block; and 6 is the pressure between the felt and the glass sheet a polishing block. The block is shown as tilted 2 adjacent the edge of the plate. which isthe position occupied by the block under Figs. 6 and 7 illustrate a modification in which v5o the influence of centrifugal force when raised a weight 19* is employed to secure the counter- 5 above the surface of the glass and when used balancing effect upon the polisher block secured 7 without the equalizing means constituting the subby the magnets of the Figs. 1 to 5 constructions.

ject matter of the present invention. In this construction, the upper face of the plate Referring to Figs. 1, 2 and 3 which show a l9 forms a track upon which rides the roller 20.

j 55: construction with the improvement applied there- This roller is carried upon a spindle 21 mounted l 1111 for free vertical movement in .the bracket 22 which is bolted to the end 23 of the arm 4. The weight 19" is sufiicient to counterbalance the tendency of the block to tilt so that the necessary pressure is secured between the'outer edge of the block and the glass sheet. The result accomplished is, therefore, the same as in the constructions of Figs. 1 to 5. a

What I claim is:

1. In combination in a polishing machinefa A rotatable driven support, a polishing block mounted on the support for rotation about its axis and adapted for tilting movement with its center of support above its center of gravity, and means for applying an electromagnetic force in a vertical direction to the block on one side of its axis of rotation to prevent its tilting under the influence of centrifugal force.

2. In combination in a polishing machine, a

rotatable driven support, a spindle mounted for vertical movement in the support, a polishing block mounted on the spindle for tilting movement with its center of support above its center of gravity, and a weight carried by the support outward of the spindle and independent thereof and adapted to apply pressure to the block so as to counteract the tendency to tilt under the action of centrifugal force.

HENRY J. GALEY. 

